NewWebSocketChannel sends a message endlessly

Mis-setting "final" variable in NewWebSocketChannel::sendInternal
leads to infinite loop.

BUG=275459
R=tyoshino

Review URL: https://codereview.chromium.org/46143003

git-svn-id: svn://svn.chromium.org/blink/trunk@161044 bbb929c8-8fbe-4397-9dbb-9b2b20218538